Question

Figure 5 below shows two connected wires made from the same conducting material and have different diameters D - 73 we current I is assumed to be the same in both wires. Assuming the current density in section 1 is 6x10 - Am 1 2 D lenovo
D = 73 mm and d= 10 mm the electric current I is assumed to be the same in both wires the current density in section 1 is 6x10^-2 A.m^-2 find the current density in section 2

Answer 1

Coon We know that the relationship between current (I), frea (A) and current density) is given by I JA (Scalar form) and Ir Jo A Cvecha fiom) As for the given data, diameter of ist wire di = B mm= 7.3 x 16²m current density of ist wire Ji= 6X102 A/m2 diameter of and wire d = 10 mm since the current in both the wire a same, we have I = I 1x 102m. JIA 3 J. Adi? 12V 7 T2 - (3) fine 6x16 2 x 173X1022 %? 6X16 2 X 7.37 AM = 3.1974 m² current density in and wire d = 3.1974 A/m²